Milling machine for formed cutters



June 1949-vv v E. SCHINDLER I 2,472,346

. MILL ING MACHINE FO R FORMED CUTTERS Filed Nov.- 11, 1943 7 Sheets-Sheet 1 I In 10 612-22219 1'. 5' ch and Zefi June 7, 1949. v E; SCH|NDLER 2,472,346

MILLING MACHINE FOR FORMED CUTTERS:

Filed Nov. 11, 1943 7 Sheets-Sheet 2 1.27 2) 61212301 c z/zln/del June 7, 1949. E. SCHINDLE'R I MILLING MACHINE FOR FORMED CUTTERS 7 Sheets-Sheet 3 Filed Nov. 11, 1945 June 7, 1949.

| SCHINDLER MILLING MACHINE FOR FORMED CUTTERS '7 Sheets-Sheet 4 Filed Nov. 11, 1943 acZz/zlneilzo June 7, 1949. E. SCHINDLER MILLING MACHINE FOR FORMED CUTTERS 7 Sheeis-Sheet 5 Filed Nov. 11, 1943 -lllllllu l i I I I I I I |.|I.IIA|."I U HHHH e ter .27. aclz/a n ablez Idl June 7, 1949. E. SCHINDLER 2,472,346

MILLING MACHINE FOR FORMED CUTTERS Filed Nov. 11, 1943 7 Sheets-Sheet 6 112v GZZTOE 50f; and/Z6 June 7, 1949. E. SCHINDLER 2,472,346

' MILLING MAGH INE FOR FORMED CUTTERS Filed Nov. 11, 1943 7 Sheets-Sheet 7 J/ at a Patented J1me 7, I949 PATENT QFLFI EORM'EDJGUTTERSEQ. i

Ernstschindler, Biel switzerland Application Novem-ber ll, 1943, Serial No. 509,911 hifirmany-septembentl,1942

a clai s, (01. 90- 15) 1 invention :relateseto impnonementstin-z millinmimachinesnforzfiormedasandzpmfilingetcutters;5

d heinbielcts loftmy impmvementsi:are,..firsts;-

cant; disk... .upon .the. settingwof the yentieal .car=.--.-

riagea Fig; showshdetei-ls of. the worigi-ng spin v; dlel,v 'ntrol}. 5 is ,a .side .view of. the spiral motiqmcontrol o'ilthe working spindlegoFig. .6 is t a frontyiew thereof; .E g 7 is'xav cuttens'etting dia-.., igamiwandli igsfi atop view of the .yerticalnar riag showing .',.a series".of.;graduate d',.rings for. setting themilli'ng spindle eccentllicity The emhodimentillustrated.comprises. the machine proper'l andQthebase column z'with the oil pan.

The principal; parts .pf the m achin e,.are: The bend; the hOriZOntaP'cari'iaJge 5,and the fvertical i; carriage 6 (Figs 2 and 3).,11pQn which 'the'1head-' stock 8- with "the'cutter spindle! may' be. verti call-y displaced. The spindle 9 with the *cutter blank l0, and -related parts'are displaceably'dise posed-j-f-in' a l manner "wellknownon" the cross On the-- latter,:-*-furthermore; the tai1-. stock I isInou'nted:

'Tw'o'electrie'motors; independent of each ,otherr-drive the cutter 'by- 'means of the endless belt 12 Fig 2);andthe cam-shaft 13 which extends-- longitudinally through the machine.

Th'e operation "eithe -machine is fully automaticyand -is effected-by mean's of seven cam I whichworkasfollows; The first'camdiskf driye the'horiz ontal: carriage 5; thsecond-a denoted'byMHn HEB-frames thejvertical carria ge 6 'byjneans .jof'the'lever. l5,"to lift the cutteri jipon "its return strolge' ofi the blankl0, "and the a'mount of; liftjisfadj'u'stedyby means of the sets'crew. I6: the ith irdfidenoted by I] in" Fig; 3- alsbsworksiover the, lever 18; i upon the .vertical carriage .fito. mill. .the'.fbrmor'. ,prjfi1'e,-. for. which purpose the said lever is fulcrumed. at.l9 to the carriage and. wsnpported by .the. ,hearing 2 I merit- L, The s k i-o th s gm nt: is e "b the fifth. cam disl; ac

which is finely adjustable by :rneansgoi-the gscreyg- 2 0:. to change th,e.- yentiealestrqkeso the carriage accerdingto the.::munhers.,ohe read-t iLthe-ievem and -3which,- indicatewthe. camm n :atios; ,th 4, a fourth, operates the 1 working spindles; control-rs ownst by me n =o .-eal ve i ho n connected with the topthedxsegment zz whichcc operates;-v throu hpthe othe t etoothedw segments 23;-25..to rockthe arm gfi to whieh the-sprin loadedpu ew tfli ifulerumedtend h ton i stroke is. adjnsteda;.by gthe ssetrgsarew m tot-nth ment 2.

The-pawlll co-actst with ga dividing disks. 29 whichat.thesametim actedt ontb th catch pawl 30vadapte d to. disengage theireleasing seg iu ed b t c w 2K8;rmt mnd m nnmnthe angular disposition pf the. recesses in the.,disc 29;}: coacting-with thepawl 21;;

The latter,;isactuated efiraisedyor zlowened xi.

.ee n e;=th m (Fig-.4); and. the rod -:3 2

The spindle control -is initiat.ed,-;by, therreleasing g segment-Bl. lifting, .the ;catch.-pawl, .30; ofi the; trapezoidal recess in they r' m 4D the; dividing: d sk: 29,:upgnwhich thepush mm 1 rotates the lat-.- ter forward' ion. :just; -one; ,-toq Theepawle 3.0., then, ;-is.caughtin-anqthersa I ,p ing of thearm 33, The-sixth gan 'i-di-sleeactuates the spiral. motioneof the working i'ipindle Fonz this; ,-purpose thesteel banch iil tunreels ;oif.., .the.5.

drum against the action of the helical sp iipglt 36 Byshifting or displacing thes qint;of attack ofithe. freehand-end, :e;+g. -by.; equrin the. letters; to. a lever,- .-the. spiralznmpticn .mayehe; xehanged =atg;

Wilha The .unreeling-pf th ;baIIdW IOIQtes-thewiden pinion 31,;in which thessaid springfifi is housed-,;; and. this rotation .is. transferredontothe tworkine spindle 9 .(Fig. 6) .:.by .means 0f;theintermediate pinion 38. This transfei'gis pt iformedlthrqiigh g the agency of the. pinion. .pair.. .397..40pivoted in the. support 42.. vTheplatten maybe. rocked .withint certain limits. and secured therein by the-.loek'}.

screw .41 so as to permit' oireyersing theis'ense'lpt,

rotation of the spindle 9,

The seventhv cam...d isl-z..(,. l.3. in Fig, 1), actuates. the bearing of then eceentrieally. monnted' milling spindle]; 'in '.case the lattershall, describe. i an arc in".accordancegwith.theg-eccentricity. set; For v this 1: urpose a. pinion 45, 'fenga'g .by the toothed segment. 46, is secured to. therear. end pf... the said, bearing,. 4.4."

Fig.2 showscleaitly. how the-segment. 46 .is ro;. tated tunder. thej in fluence. of. the belli'shapedcain,

6 disk 43 by way of the arms 41-50. A hinge part located between the arms 48 and 49 and adjustable by displacement, permits of accurately regulating the swing of the eccentric milling spindle.

The tension roller 52, acting upon the band 34, serves for securing a precise engagement of the teeth of the dividing disk 29 by the catch pawl (Fig. 5).

All cam disks keyed to the shaft 13, with the exception of the cam disk 43, are housed in the bed 4. The control devices illustrated in Figs. 4-6 are house in the box 53, shown by dash-and-dot lines in Fig. 2. In Fig. 1 the said six cam disks are situated approximately at the points I-VI, keyed to the shaft IS.

The cam disks II, IV, and V never are taken off, while the disks I, III, and VI are mounted or demounted through the bearing covers 54 and 55 (Fig. 1). controlled as follows:

The eccentric cutter spindle l is adjusted in the following manner: In the first place, the radius R2 of the circle to be described by the cutter 51 (Fig. '7) has to be determined on the enlarged form 55 of the formed cutter. The eccentric is released by loosening the screw 58 (Fig. 8), upon which the ring 59 with the eccentricity division may be turned by means of a socket wrench until the number (reading to is of a millimeter) corresponding to the desired radius lies under the pointer 60. Second, the angular amount of rotation of the spindle 7 must be ascertained, so that the cutter 5'! will cover a path fixed by the measured angle (c+d) of Fig. '7. This is checked by means of the ring 6|, provided with a circle division, which may be turned after loosening the screw 62. The value then is set by shifting the point of attack of the hinge 5| on the lever 48 (Fig. 2). Third, the spindle 7 has to be brought into its correct position, i. e. the cutter, after a revolution of 0 degrees, should rest on the point of cuhnination in the example chosen in Fig, '7, whereby the degrees are read off the division of the ring 63 and correspond to the eccentricity at hand. If the culmination has been set accurately, this number of degrees also must lie oif the pointer 60. In order to permit of displacing the toothed segment 46 relative to the movement coercively transmitted by the cam disk 43, the hinge 5| is connected to the arm 49 by way of a rotatable joint 64 (Fig. 2).

The sense of spiral movement, rightor lefthand, is set by means of the support 42 (Fig. 6),

and the running distance by means of the set screw 28 (Fig. 4), Care must be taken that the dog or raiser pin 65 sufiiciently lift the push pawl 21. The correct engagement of the pawl 30 in the corresponding tooth is obtained, as mentioned above, by displacing the tension roller 52 for the steel band 34 (Fig. 5).

Cylindrical cutters heretofore usually have been made in the large universal milling machines, and the switching over from one tooth to another had to be done manually. In case the cutter had to be milled on its face also, a second chucking operation became necessary.

In the machine according to the present invention, the adjusting is done automatically and the face is milled in the same chuck setting,

Manufacturing on the universal milling machines known heretofore presented further difficulties in the fabrication of tapered or beveled cutters. The work piece has been rotated by change speed gears for the production of the The movements then are adjusted an 4 spiral. By such transmission, however, the work piece was rotated at a certain fixed speed, which is not correct for a tapered piece, since the peripheral speed increases with the diameter or, in other words, the pitch angle becomes greater.

The machine according to my present invention, while generally controlled in a manner known by cam disks, differs from the automatics known heretofore in that three cam disks are provided for the definition of the cutter profile, which actuate levers of variable transmission ratios and thus control the position of the milling spindle. The first of these three cam disks raises or lowers the vertical carriage on which the milling spindle is eccentrically mounted. The second actuates the horizontal carriage, and the third rotates the sleeve in which the milling spindle is eccentrically mounted. This latter or third cam disk permits of maintaining the spiral at a certain fixed angle in spite of the difference of diameters.

The manufacturing of so-called formed or profiling cutters (cherries, round-nosed or chamfered cutters. and a long line of special cutters) heretofore has presented quite a number of difliculties. Usually special machines have been built, i. e. a machine for each form. The form itself then was defined by a curve sleeve. With the cutter advancing, the curve sleeve was rotated coercively. If, now, the spiral pitch had to be changed or turned right or left, a new curve sleeve had to be made first; while in the present machine all these changes are made by means of a screw, Furthermore, the templet producing the form heretofore had to be changed with every slight change of the base form.

The latter in the present machine may be varied in relatively wide limits, since the longitudinal travel may be changed in the ratios 122:5, the vertical travel 1:10, and the eccentricity of the spindle from 1-10 mm. All these changes, moreover, may be made independently from each other. This feature is of marked advantage in cases where only small series of cutters have to be produced, after which bigger or smaller cutters may be made by changing any one of the said three movements.

By means of the present universal milling machine more difierent kinds of cutters may be produced, and this in a fully automatic way, than in any milling machine for universal cutters known heretofore.

What I claim and desire to secure by Letters Patent is:

1. In a cam controlled milling machine of the kind described, a horizontal work supporting carriage, a vertical carriage, a cutter spindle, a sleeve chuck eccentrically mounting the cutter spindle on the vertical carriage, and first, second and third cam devices for determining the position of the cutter spindle with respect to the work piece at any stage for defining the work profile, the first cam device displacing the vertical carriage with the cutter spindle during cutting, the second cam device displacing the horizontal carriage and the third cam device turning said sleeve chuck an adjusting device comprising a rotatable ring having lineal graduations and indicating the eccentricity of said spindle, a. second rotatable ring having circular graduations, and a third ring keyed to the last mentioned ring and having a division indicating the position of the point of culmination relative to the said eccentricity, the several rings bein mounted on the cutter spindle.

2. In a cam controlled milling machine of the kind described, a horizontal work supporting carriage, a vertical carriage, a cutter spindle, a sleeve chuck eccentrically mounting the cutter spindle on the vertical carriage, and first, second and third cam devices for determining the position of the cutter spindle with respect to the work piece at any stage for defining the work profile, the first cam device displacing the vertical carriage with the cutter spindle during cutting, the second cam device displacing the horizontal carriage and the third cam device turning said sleeve chuck, a control device comprising an additional cam, a drum for rotating the spindle, spring means acting on said drum and a steel band wound on the drum and unreeling therefrom against the tension of said spring means under the control or said additional cam.

3. In a cam controlled milling machine of the kind described, a horizontal work supporting carriage, a vertical carriage, a cutter spindle, a sleeve chuck eccentrically mounting the cutter spindle on the vertical carriage, and first, second and third cam devices for determining the position of the cutter spindle with respect to the work piece at any stage for defining the work profile, the first cam device displacing the vertical carriage with the cutter spindle during cutting, the second cam device displacing the horizontal carriage and the third cam device turning 6 said sleeve chuck, a control device comprising an additional cam, a drum for rotating the spindle, spring means acting on said drum, and a steel band wound on the drum and unreeling therefrom against the tension of said spring means under the control of said additional cam, and reverse gearing interposed between said drum and said spindle for determining the direction of rotation of the latter.

ERNST SCHINDLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

